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Just had this hot water heater installed approximately 2 years ago. I’m not sure what is causing the corrosion. Also, the tenant said the water inside is way too hot and that it started about three weeks ago.

  • Which side is the hot port and which side is the cold port? – ThreePhaseEel Jan 20 '19 at 1:54

The corrosion is being caused be a poor solder job. The joints are slowly leaking. Next time get a real plumber to do the job and don't call this company back. By the way, the discharge pipe for the T&P valve is to be run in a full pipe size not a reduced pipe or tubing as it looks like yours was installed. That in itself shows that the "butcher" that installed this water heater needs to find a different line of work. If by chance the installing company is a good and reputable company, call them back and show them work done by their employee and maybe they will re-do the installation for free or at a reduced rate.

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